CVE-2017-5446: Mozilla: Out-of-bounds read when HTTP/2 DATA frames are sent with incorrect data (MFSA 2017-11, MFSA 2017-12)

Severity: Critical

CVSS Score: 9.8

An out-of-bounds read when an HTTP/2 connection to a servers sends "DATA" frames with incorrect data content. This leads to a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.